Pol Gen Srivara Ransibrahmanakul said the blast happened at Phramongkutklao Hospital, a military-owned hospital that is also open to civilians.

‘From the initial report it was a bomb … there are more than 20 people injured,’ he told reporters.

The Thai authorities have a history of providing misleading information in the aftermath of similar incidents. In 2015 the terror attack on the Erewan Shrine, which claimed 20 lives, was initially described as a gas delivery lorry accident and more recently a bomb blast outside the Bangkok National Theater was dismissed as a ‘falling sign.’

The Royal Thai Army immediately ordered an investigation into who is responsible for the bombing, which occurred on the third anniversary of seizure of power by the Thai military from the previous government of Prime Minister Yingluck Shinawatra.

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